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When Cloudflare Went Down: A Friday Night Story

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Everything started around 17:00 (UTC+7). I received a DM from our support team. They noticed something strange while using our internal tools. When they clicked a link, the speed was very slow, and they sometimes saw a Cloudflare 500 error.

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At first, I tried to help, but we couldn't find the root cause. Since we had just released a new version of the company’s API, I thought the servers were just resetting or reconnecting.

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The Problem Gets Worse

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After 30 minutes, the situation became more serious. Our CTO started seeing the same errors. We began to feel a bit worried—especially because we had just released a new monitoring tool that day! Soon after, our Sentry tool started sending many alert emails.

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After 30 minutes of stress, I searched through the system and the release history. Finally, I checked DownDetector.

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I found the real reason: Cloudflare was having service issues. We felt relieved because we didn't need to change our code or fix the new release. Since these problems usually get fixed quickly, I sent a report to the CTO and started my trip home around 19:00.

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Part Two: A Global Issue

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The \"real duel\" began at 19:30. After dinner, I tried to open a manga website like I usually do. It was extremely slow and eventually showed a 500 error. At the same time, my girlfriend and her friends couldn't play League of Legends.

\r\n

That is when I knew something big was happening. I checked our company website; it was still working in Thailand for a moment, but not for long.

\r\n

Five minutes later, the CTO contacted me again. He said our branch in Denmark (Europe) could not access the website at all. I checked DownDetector again and sent a report to the company group to explain what was happening.

\r\n

What I Learned

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By 21:30, the problem disappeared. After I wrote a final incident report for my boss, I thought about what happened. This situation taught me a few important lessons:

\r\n

\r\n
Good tools help you stay calm: Even when things go wrong, having good monitoring and testing helps you understand the problem faster.
\r\n
\r\n
The \"Single Point of Failure\": When a huge service like Cloudflare fails, many other websites fail too.
\r\n
\r\n
Plan B: Our team is now discussing a backup plan in case Cloudflare has problems again in the future.
\r\n

","Urgent call from Cloudflare outage","2026-03-06 10:24:42.089Z","actionData","errors"]

Writing about tech and unforgotten events